Type-writing machine.



ArPLIoATIoN FILED snr'r. 2e. 19.00. Mmmm un. 1a, 1904. 4

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No. 760,719. l PATENTBD MAY 24, 1904.

` y o. E. YETMAN.

y .TYPE WRITING` MACHINE.

VAPILIGATION FILED SEPT. 28. 1900. RBNEWBD MAB, 18, 1904.

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*PATENTE-D MAY A24, 1904. (LxB. YBTMAN. V yTYPE WRITlNGMAGHINB.APPLICATION FILED BEPT. 26. 1900. RENEWED MAB.. '18, 1904.

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PATBNTED-MAY 24, 1904'.

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No. 760,719.- PATENTED MAY 24,1904. c. E. YETM'AN.

TIPI: WRITING MACHINE. APPLICATION FILED SEPT. 26. 1900. RBIEWED MAR.18, 1904.

N. 750,719.' l 'PATBNTBD.MAY 24,1904. G. E. IYBTMAN. l TYPE WRITINGMACHINE.

APPLI'OAT'ION ILBD SEPT. 26.1900. BENEWED MAR. 1a, 1904.'

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- PATBNTED MAY 24, 1904.

l c. E. YETMAN. ,TYPE WRITING MACHINE. .APPLICATION FILED SEPT. 26.1.900. REXEWED MAB. 18, 1904.

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. NQ. riwf/19. A y PATBNTED MAY`24, 1904.

G. E. YETMAN.

TYPE WRLTINGMACHINB.

APPLIOATION FILED $2220.20. 1000. RBNWED' MAB. 1a', 1004.

.N0 MQDEL. 13 SHEETS-SHEET 9.

L illlll' n" @mam/Q No. 700,719.. "PATENTED, MAY 24, 1004.v

- 0. E. YETMAN.

TYPE WRITING MAGHINE.

, n PLIoATIoN FILED SEPT. z 0. 1000.EENEWEDMEE.- 1s, 1904. N0 MODEL, 13SHEETS-SHEET 10.

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PATENTBD MAY 24, 1904.'

v c. E. YBTMAN. VTYPE WRITING MACHINE. APPLICATION HLBD sLfPT. ze. 1900.'RENBWED MAB. 18.*1904.l

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TYPE WRITING MACHINE. .ArPLIoATIoH FILED sIrr'I. 2e. 1960.. Brunn nu.18,1904.

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. No. 760,719. I PATBNTED MAY 24, I9o4.-

c. E.. YBTMAN. I TYPE WRITING MACHINE. PPLIOATION FILED SBPTI-'. 1900.lRENEWIAID HAR. 18, -1904.

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j No. 760,719.

" UNITED STATES Patented Mey 24., 1904.

PATENT OFFICE.

n v.FLASH COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION. n

srEcIFIoATIoN I fet-ming part ef Letters Patent No. 760,719, dated Mey2:1, 1904. I Application 'Iileil September 26,1900. Renewed March 18,1904. v Serial No. 198,835. (No model.)

To a/ZZ whom it may concern,.-

.particularly pointed out inthe- Be it known that I, CHARLES E. YETMAN,a resident of Oakpark, in the county of Cook@ andy State of Illinois,have invented certain new and useful Improvements in Type-WritingMachines, of which the following is afull, clear, and eXact description.

This invention has relationv to that-class of type-writing machines inwhich the paper to' bel printed upon is supported upon a platen mounteduponv a carriage adapted to moveA transversely with the machine, themovements: of [the carriage being effected through' suit-l ableescapement mechanism controlled by the `Irianipulation of thelkey-levers whereby the type-bars are operated. In theaccompanyingdrawings the invention is shown as applied to that class oftype-writing machines now commonly known as visiof even date herewithand bearing Serial Nos.

31,198and 31,200, and I do not wish to be understood as claiming hereintheI features specifically claimed in such companion applications..

Figure 1 is a View in elevation ofthe right-v vhand end of the machine.vFig. 2 is aview in elevation of the left-handend of -themachine Fig. v3is aview in vertical longitudinal sec- -ti'on"(from front to rear). ofthemachine.

` 4Fig 4 is a detail view, in horizontal section,i

through the bearing of the carriage-retractinglever-at the right-handside of the main frame. Fig. 5-is a view in vertical longitudinalsection from front to rear through the main frame'of the machineadjacent one side theref, showin g the carriage-'retracting leverl andcertain parts connected therewith. Fig. 6

Triage-retraction spring.

y is a detail view, 'in horizontal section, through the mechanism shownat the right hand of Fig. for adjusting the tension of the car- Fig. 7'is a detail front view'of the paper-carriage and parts sustainedthereby. Fig. 8 is a detailfront view of one of the journal-brackets forthe front presser-rolls of the paper-carriage.

Fig. 9 isa detail back View of one of the paper- I guide ngers and theplate extending upward therefrom. Fig. 10 is a detail back view of thepaper-carriage and parts sustained thereby. Fig. 11 isa detail plan Viewof the papercarriage frame, parts being broken away.

Fig. 12 is a view in vertical' section on line 12 12 of Fig. 7 Fig.13-is aview in vertical section on line 13 13 ofFig. 7. Fig. 14-is'jaView in vertical section on -line -14 14 of Fig. 18. Fig. 15 is a detailplan view of the escapement ratchet-wheel, the dogs adjacent theretobeing .shown in section on line 15 15 of Fig'. 14. Fig. 16 isa detail'frontview of the escapement mechanism, certain adjacentV parts beingshown in vertical section. Fig-17 is a f detail side view of theescapement-dogs, the

shaft wheren the dogs are mounted being shown f in cross-sectlon/ Fig.v18 1s a plan view-of the carriage-operating mechanism,

parts being'shown in section and the top of thexmain frame beingremoved. Fig.19 is a view in vertical longitudinal section'(fromfront-to rear) adjacent the upper-case lever at the left-hand side ofthe machine, parts being .shown in elevation. Fig. 20 isan enlargeddetail side view of theplaten-shifting mechanism,-parts ofthe'mainframe, the carriage, andthe platen .being-shown 1n vertlcalcross-section. Fig.'y 21 is a detail front 'View of the platen-lockingmechanism, the" adjacent side'fwallf' 0fl the main frame being shown insectioni" Fig. 22 is a view in central vertical section'k through theparts shown in Fig. 21.

Fig. 23 is a detail viewin vertical cross-section through the crank andshaft shown at theright-hand side of Fig. 22,'a'djacent parts being inelevation. Fig. 24 is a View in vertical section on line 24 24'of`I`igf2l2fv- Fig. 25 is a view similar to Fig. 24, but-'showing the`parts in different position. Fig. 26 is an end elevation of thepaper-carriage and parts sustained thereby.

In the accompanying drawings the invention is shown as embodied in amachine having a main frame or casing eomprisingabase portion A and anupper portion A', upon which latter the carriage is sustained.

The finger-keys B are pivoted at their rear ends to a transverse bar 3and extend forwardly to the keyboard of the machine. Transverse bar 3 issustained from a transverse bar 2. The key-levers B are provided withupwardly-extending offsets to which are connected springs 5, `whichserve to hold the keylevers in their normal uplifted position.Supplemental uprightV levers C are pivoted at their lower ends, as at c,to the transverse bar 5. The uprights or offsets of the key-levers Bhave pin-and-slot connections c' with the supplemental levers C.Type-bars D are pivoted to suitable hangers D', which are held in placeby a bolt 10 upon a semicircular stepsupport D2. The inner ends of thetype-bars D are connected to the supplemental levers C by suitablelinks. In Fig. 3, for the sake of clearness, only a single type-bar andits operating connections are shown. It will, however, be understoodthat the type-bars are grouped in semicircular series about theprinting-point on platen W in the manner usual with type-writers ofthevisible front-strike type. The arrangement of key-levers, supplementallevers, and type-bars form no part of the present invention, but arefully described and claimed in 'a companion applicatior, Serial No.31,198, filed of even date herewit i.

Across the front of the machine is a rack A2 fory holding thestenographers note-book, &c. This rack is provided with an upturnedlower edged and bent brackets a2, by which it is supported from the topof the machine, being secured thereto by thumb-screws a3. The heights ofthe parts A and A of the machine are so proportioned that this rack maybe located, as shown, directly before the eyes of the operator withoutobscuring either the keyboard or the printed line, and I believe that Iam the first to construct a copy-holder of this sort. Across the top ofthe upper portion A of the main frame extend the carriagetracks 50 and51, between which are placed the rails 52 and 53 of the carriage J. Thecarriage-tracks 50 and 5l and the carriagerails 52 and 53 are providedupon their opposing faces with suitable grooves to receive theantifriction-balls 54, stops being provided to prevent the passage ofthe balls from out their grooves. The re'ar track 51 of thepaper-carriage (see Fig. 14) will be mounted upon the main frame in suchmanner that it may be adjusted by means of set-screws at its rear inorder to compensate for any wear in the bearings; but as this forms nopart of the present invention it need not be more particularlydescribed.

The paper-carriage J is preferably formed as a casting, comprising thefront and rear walls 52 and 53, the central web j, and arched end platesj and J2, and between the arched end plates the platen W and coperatingparts will be sustained. To the under side of the front carriage-rail 52and extending lengthwise thereof is secured a rack-bar 55, with whichengage the teeth of the gear-wheels 56 and 57. These gear-wheels aremounted upon a shaft 58, (see Figs. 3 and 18,) one end of which is shownas journaled in a bracket 59, while the opposite end is journaled in athreaded bearing projecting inwardly from a boss or offset at the backof the main frame. 'Ihe gear-wheel 56 is loose upon the shaft 58; butthe gear-wheel 57 is fixed thereto, and to this shaft 58 is also fixed abeveled gear 61, upon the rearwardly-extending hub of which thegear-wheels 56 and 57 are preferably mounted. The beveled gear 61 mesheswith the corresponding beveled gear 62, that is fixed to a cross-shaft63. The cross-shaft 63 has its inner end journaled in the bracket 59,and its opposite end is journaled in a suitable bearing at theright-hand side of the main frame of the machine. A set-nut 64 upon theshaft 58 serves to hold the gear-wheels 56 and 57 in position upon theshaft. On the shaft 63 is fixed a pinion 65, with which engages asegment-rack 66, (see Fig. 5,) that is carried at the inner end of aplate 67, fixed to or formed in piece wi th a rock-shaft 68, that isjournaled in the side wall of the main frame. The outer end of therock-shaft 68 has connected thereto a crank-handle 69, that extendsforwardly at the right-hand side of the machine aud within easy reach ofthe operators hand. The plate 67 is shown as formed with a suitablecam-shaped or curved surface 70,over which passes the carri age tape orcord 71, the inner end of this tape or cord being conveniently fastened,as at 72, to the plate 67 .I The tape or cord 71 passes downward beneatha friction-roll 73 and is connected` to the inner end of a coil-spring74. The opposite end of this coil-spring 74 is attached to an arm 75,(see Figs. 5 and 6,) the upper end of which is formed with a threadedhole through which passes an ad j usting-serew 76, whereby the arm 75lnay be moved forwardly or rearwardly in order to adjust the tension ofthe coil-spring 74. The screw 76 passes through a hole formed in theangular plate 77, that is attached, as by the screws 78, to one side ofthe main frame, an opening being formed in the front of the main frameto expose the head of the screw 76, so that it may be convenientlyadjusted by the operator. It

will thus be seen that by turning the screw 76 the operator can vary thetension that the spring 74 exerts upon the tape 71 and upon The purposeof the hand-lever the carriage.

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65 characters and render the operation ofthe 69 is to enable theoperator` to readilyfshift the carriage in forward or back warddirection,v .A

reference to Figs. 1, 5, and 18 it will be seeny that if the handle 69be in the position there -shown and the operator depresses the handle-it will rock the shaft 68 and turn upwardly the segment-rack 66, whichin turn will impart partial revolution to the pinion and shaft 63 and`throughthe medium of the beveled .gear-wheels 62 and 61will impartpartial'revolution to the gear-wheels 56 and 57. Inasmuch as thesegear-wheels are in constant engagement with the rack-bar 55, attached tothe under side of the carriage, it is manifest that as the handle 69 isthus depressed the movement of the carriage from left to right will beeffected, the extent of this movement depending upon` the amount ofdepression *f given to the handle.

Vlith the loose gear-wheel 56 meshes a pinionv80, that is mounted upon acounter-shaft 81, (see Figs. 1-4, 16, and 18,) lone end .of thisVcounter-shaft being journaledin a bracket 59,

bolted to the side wall of the main frame,

fwhile the opposite lend of this shaft 'is` jour-. k naled in a threadedbearing-block 83, that is fastenedl to the inner end of a boss 'orinwardv vextension 84 on the back plate of the main frame. Thegear-wheel 8O is connected to or lformed in piece with a sleeve 85, thatis loosely: mounted on the shaft 81, one end of. this sleeve beingformed with clutch-teeth 86, thatfy .engage corresponding teeth 87,formed upon `the hub of a worm 88, that vis fastened to the,` shaft 81.The clutchteeth 86 and 87 are= forced normally into engagement by acoil- Vspring 89, that' is mounted on the shaft 81,l one end of thespring setting within an annu 'lar recess of the sleeve 85, while the'opposite en'd ofthespring bears against a washer 90, that is mountedonthe shaft 81.

the escapem'ent-dogs L and L', to be'presen'tly is necessary that thepropelling-spring shall befree to exert its pull upon the carriage totakev up thel play or backlash between the lteeth' of the carriage-rackand theteeth of the` escapement-pinion. Y If thel carriage were not soheld. it could move loosely backward and yforward on its bearings to theextent of the backlash between the teeth Vof the rack and?y theescapement-pinion. Thismovement would of course affect the spacing ofthe printed l Between: the washer 90 and a threaded nut 91, also on4`the shaft 81, is held the escapement-wheel' K, having teeth le,adapted to be engaged by machine defective. In the usual constructionthe'propelling-spring is directly connected to the carriage; but in thepresent construction the propelling-spring is connected through thesegment 66 and the train of gears 65, 62, 61,

and57 and rack 55. It is, nevertheless, necessary that thepropelling-spring should bel able to exert adireetpull upon thepaper-carriage. If, for example,.the fixed gear 57 engaged directly withthe escapementpinion 80,

pellingspring and .the Aescapement will be:

connected to the carriage by independent geartrains. With thisconstruction it is clear that the propelling-spring is free to exert apull to hold the carriage toward the left, while the escapement, throughthe gears 8O and 56, operates to hold the carriage to the right. Inother words, the loose gear56v engages the carriage-rack V55 to hold thecarriage in position, while the gear 57 isyfree to engage the rack tomove the carriage forward and takeV up the backlash between the teeth ofthe rack andl the teeth of the gear 56-that is to say, the teethoftherack are locked between'the, teeth of the loose gearwheel 56 and thevteeth of the'tight gear-'wheel 57.

By reference to'Figs. 14 and 18 of the d rawings it will'be seen thatthe teeth 86'and 87 of the clutch are'so inclined that when thegear..--` wheel 8() is turned in one direction the teeth willinterlock-Av and impart revolution to the shaft 81 and to theescapement-wheel K; but when the gear-wheel 8O is turned.` in theopposite direction the inclined 'faces of the teeth 86 will ride overthe corresponding inclined. faces of the teeth 87, thespring 89 allowingthe sleeve 85 to yield for this purpose.- When l the paper-carriage Jismoved in `backward direction through the medium of the handlever 69,as above described, or in any other manner, the gear-wheel 8O is turnedby the gear-wheel'56;v but during thisbackward -movement of the carriagethe teeth. 86 ride over theteeth 87 in manner last described withouteffecting the movement of the shaft 81.` The worm 88v mesheswith theteeth of a lworm-wheel 93 upon the shaft'94, thisl shaft roo and 17,)that is fixed to a short shaft 101, the

inner end of this shaft being journaled in a bracket 102, secured totrack 50, while its opposite end is journaled upon a bearing-screw 103,projecting inwardly from one side of the main frame. On one end of theshaft 101 is fixed a stop-arm 103,'adapted to contact with a stop 1081,that projects inwardly in the path of the arm, and thus limits themovement of the shaft 101. The shaft 101 has fixed thereto a collar 104,provided with a crank-arm 105, to which is connected the upper end of alink 106, the slotted lower end of this link (see Fig. 14) beingconnected 'to the upper arm 107 of the bell-crank that is mounted uponthe shaft 108, which extends from side to side of the main frame and isjournaled on suitable bearing-screws at its ends. Each end of the shaft108 has fixed thereto a depending crankarm 109, the crank-arm shown atthe lefthand side of the machine being preferably in piece with the hubof the crank-arm 107, and each of the crank-arms 109 are pivotallyconneeted. as at 110, with links g3, that lead inwardly from theupwardly-extending portions of the universal bar Gr. The bail oruniversal bar Gris pivoted to the support for key-levers and extendsforwardly, as shown in Fig. 3, beneath such key-levers, is upheld bysprings in the manner already described with reference to thekey-levers, and is provided with an upwardly-projecting portion, asshown in Fig. 19, which is connected to the crank-arm 104. Theescapement dogs L and L' are drawn to their normal position by means ofa coil-spring 112, one end of which is connected to the stop-arm 103,while its opposite end vis connected to a threaded rod 113, that passesthrough the back plate of the main frame and is there provided withan'adjusting thumbnut 114. ln Fig. 15 of the drawings theescapement-dogs L and L are shown in their normal or idle position withrespect to the escapement-wheel K. If now the universal bar be rocked,as by the depression of a keylever or of the space-bar, so as to moveforwardly the connecting-links g3 in the direction of the arrow, Fig.14, the dog L will pass Afrom engagement with the pointed end of theadjacent tooth of the escapement-wheel K.

INow inasmuch as the escapement-wheel is connected, through the shaft81, the gearwheel 80, the gears 56 and 57, the beveled `ge'ars61 and 62,shaft 63, and gear-wheel 65,

with the rack and plate 66 and 67, to which the carriage-retracting tape71 and spring 74 are attached, it will be seen that there is a Hencewhen the dog L is swung 101, so as to clear the point of the adjacenttooth r. the escapement-wheel K will turn in the direction of the arrow,Fig. 15, andthe.

tooth will pass through the space between the points of the dogs L and Las the dogs swing in opposite direction upon the release of theuniversalbar. As soon, however, as the universal bar is thus released the dog Lis rcstored to the normal position, (seen in Fig. 15,) and asthcadjacent tooth of the escapementwheel has passed between the dogs thencxtsucceeding tooth of the wheel will be caught by the point of the dogL. Heretofore the dog L has been formed upon one side with a beveledface and upon its opposite side with a face parallel with the plane ofmovement of the dog, and the teeth 1 of the escapement-wheel have beenformed upon one side with beveled faces and upon the opposite side withfaces at exactly right angles tothe plane of the wheelthat is to say, inprevious constructions the bearing-faces of the dog L and the teeth 1which are normally in contact at the end of the letter-space movementare arranged parallel to the movement of the dog L, while as in thisinstance the end of the dog L and the side of the teeth f: which are inengagement with the end of the dog L the teeth 1 pass between theescapement-dogs L and L are beveled or inclined, so that the springsconnected to the escapement-dogs will be brought into play to cam orforce the members of the escapement rapidly past each other. l havefound that with such prior construction when the universal bar wasreleased and a tooth of the escapement-wheel struck the opposing face ofthe dog L there was a tendency of the wheel to rebound and in so doingto slightly .spring and force laterally the dog L, so as to permit thetooth to pass between the dogs, and thus sometimes fail to promptlyarrest the carriage. By reference to Fig. 15 it will be seen that thedog L and teeth 1 have their opposing faces, which are in engagement atthe end of the letterspace movement, slightly inclinedthat is to say,the bearing or normally contacting face of the dog L isinclined to theplane of movement of the dog, while the bearing or normally contacting`faces of the teeth /fc are correspondinglyinclined slightly to the planeof movement of the wheel. Hence when the teeth strike the bearing-faceof the dog L there is a tendency of the dog and teeth to interlock, soas to prevent the accidental slippingof the dog from engagement with thepoint of the tooththat is to say, the normally opposing faces of theteeth and the dog L, which are in contact at the end of the letter-spacemovement, are so inclined that the carriage-propelling` spring, whichnormally urges the ratchet-wheel K in forward direction, is brought intoplay to cam or lock the escapement members together at the end of theletter-space movement. In practice l have found thata comparativelyslight inclination of the opposing or normally contacting faces of thedogL and of the teeth is very effective `in preventingthe accidentaldisengagement of IOO . the dog and teeth and consequent skipping of thecarriage; and with this construction it also becomes possible to. holdthe escapement-` wheel 'by a very slight interlock of its teeth with thedog, and hence the dog will respond more quickly tothe action of thekey-levers.

vIt will'thus be observed lthat not only the end of the dog L but itsbearing face or side is inclined or beveled to the plane of itsmovethe-pin on the arm 107 engages a slot in the link 106 and is normallypositioned centrally inthe slot, so that the dogs are not operated,until the universal bar has been-'depressed to some extent and areat`rest before the universal bar returns to its normal position. In thisway the operation of the escapement is extremely'rapid, while at thesame time the vibration of the universal bar after it has been depressedand returned to-normal is not transmitted to the escapement-dogs, sothat there is no danger of a double'operationofthe escapernent. Manytype-writers have this fault of skipping in thisway, and .I have. usedthis simple means to-prevent it in thismachine.

Between the end-bars j" and f2 of thecarriage J extends a rocker-plateM, that is pivoted, as at m, to the end bars ofthe carriage and-has itsinner edge formedwith the usual notches to receive the adjustablemargin-stops, bell, &c. To the rocker-plate M adjacent the left-handend` is attached a bracketM, having an'angnlar` portion M2', thatextends through ay hole ff, formedl in the endplate-.of the` carriage,this angular portion "being furnished ywith a iinger-piece,whereby itmay be conveniently manipulated by the'operator. vTo lthe `under side ofthe rocker-plate Mat itscenter v (see Fig. 14).is connected a dependingarm 12.0, that carries at its lower end afriction-.roll 121, adapted totravel in fr'n't of a carriage-release bar .122, thaty extends from sidetosideof the 1 l mainframe, "this bar-having downwardlyturned ends 123.,that are -pivoted, as at 124, to the sidewalls ofthe main frame. The.lower end offone ofthe arms' 123 of therelease-` bar is extendeddownwardly considerably below its pivot-point and is bent inwardly-andattached .to a slidingyoke-frame 125, .(see

Fig. 18,) that is mounted in. manner.v free to l sl-ide upon a shortshaft 126, -that projects inwardly from a boss or offset 84 at thehack'` of the main frame. Uponvr this shaft-126.is a coil-spring 128,one end' of which engages astop 129'on theshaft, while the other. end ofthe spring engagesone `end of the yokeframe 125, the spring serving tohold the yokesleeve 85 and bears againstthe gear-wheel 80. `(See Fig.14.) Hence it will be seen that whenever it is desired to'manually shiftthe carriage in either directionwithout the oper,- ation of thefinger-keys or of the carriage- ,shift lever above described theoperator can readily accomplish this by drawing forward lthefinger-piecev at the end ofthe bracket M',

(see Figs. 14 and 20,)'thereby causing the rocker-plate Mto turn about.its pivots and in so doing to cause the arm to engage and forcerearwardly the release-bar 122,

which in turnwill cause the yoke-frame to beshifted upon the shaft 126in such manner as to force .the clutch-teeth 86 from engagementv withthe clutch-teeth 87. When the lclutch-teeth are thus disengaged, thecar-i ria'ge may be manually shifted iny eitherfdirection withoutimparting revolution tothe shaft 81-or to the ribbon-feeding mechanismdriven therefrom. j

The'platenW (shown in Fig.'20) is mounted .upon-a shaft w, that isjournaled in tlie end bars and 136 of the platen-frame, and tothe.shaftl fw are pivotally connected the platen-supportingfarms 137, thatare pivoted, as at r138, to the vertical end plates j and f2 of thecarriage. By reference to Figs. y'1 and 26j-it will be seen that the'endbarsof the platen-,frame areprovided with offsets 139, through whichpass set-screws 14,0, the ends of these set-screws being adaptedtocontact IOO with lugs j at the top of the end plates of the carriage,s o as to accurately determine the normal position of the platen. Theend bars 135 .and 136 of the platen-frame are connected together by rods142 and 143, that extend above and below the platen. In order to effectthe shift of the platen to enable either one of the two types carried ii by each of the type-bars D to be brought to the printing-point, themechanism next to be described is provided. To the;.ends of-they lower,front rod 143 of the platen-frame are pivotally connected, as byscrews; 147, .the upd per ends of the' crank-arms'148 and 149, thatproject forwardly-from a rock-shaft 150, that extends-fromend .to end`of the. carriage and -is journaled. at the /basefthereof. (S'eeFig..

20..) Centrally upon this rock-shaft is mount- .ed a depending armv 151,that carries at its lower end a friction-wheel 152,.the periphery of.which is adapted to travel.v along andfin front of a shifter-plateP,..that extendsffrom sideto side of the main frame and is `pivotedthereto, as at 154, l Preferably-the lower pordepending crank-arm p2,and theilowere'nd of this crank-arm pzphas pivotally connected thereto,as at p3, (see Fig. 20,) the rear end of a link 158, the forward end ofwhich link 1 is pivotally lconnected to a crank-arm 159 of ashort shaft160.

(See Fig. 22.) This shaft 160 is journaled in a bracket a5, bolted tothe inner face of the side wall ofthe main frame. Extending outwardlyfrom' the end of the shaft 160 is ashort shaft-161, that extends throughthe side wall of the main frame, beingjournaled in a suitable bearingtherein. Upon the shaft 161 are fixed the crank-arm 162Y and thestop-arm '163, the stop-arm being adapted to contact with the pin 164,whereby the .link 158 is pivoted to the arm 159. (See Figs. 21 and 25.)To the upper end of the crank-arm 162 is pivotally connected, as at 165,the upper arm of a yoke-bar R, the lower armof this bar having connectedthereto lone end'eof'a coil-spring R', the opposite end of .which springis suitably attached to the main frame. The stop-arrn163 isinthe samevertical plane as the yoke-bar R and is adapted to engage therewith whenthe parts are'in the normal position seen in Fig. 24-that is to say, inthe position which-the platen will occupy when lower-case letters `areto be printed. The outer end of the shaft -161 has fixed theretoafthumb-wheel 169, whereby the shaft may .be .manually turned for thepurpose to be presently explained. The inner end of the shaft160 hasconnected thereto a cra-nk-arin :170, the connection between the shaftand crank-arm being effected by means of a p'in 171, that passes througha slot 17 2in the hub of the crank'- arm. (See Fig. 23.) To the lowerend of the crank-arm 170 is connected by a pin-and-slot connection theupper end of the vertical arm 173 of the upper-case keylever. Byreference more.` particularly to Figs. 2O to 25 of the drawings it willbe seen thatwhen the parts are in the normal position shown in Fig.y 2Othe tendency of the spring R- is to hold-them in such position. Ifnow,however, it is desired to print upper-case letters, the platen. W mustbe raised, andto effect this-the yupper-case key-'lever will bedepressed in the usual manner. This depression of the upper-casekey-lever will rock forwardly the vertical army 173 and cause the crank170 to turn the' shaft 160 in the direc- -tion ofthe arrow, Fig. 23. Asthe" shaft 160 is thus turned it will rock forwardly the crank 159,thereby causingl this crank, through the medium of the link 158 and thecrank p2, to swingforwardly the shifter-plate P. This forward swingofthe shifter-plate will through themediuni of the roller 152 and arm151 rock the shaft 150, thereby Vcausing the arms 1.48 and 149 to liftthe platen-frame and platen from the normal or lower-case position tothe position at which upper-ease letters'wi'll be printed. Inasmuch asthe shaft 160 is disconnected from' the shaft 161 and the crankshaft'161or its cranks.

arms carried thereby, it is manifest that this movement of the shaft 160will not affect the lllrhen, however, it is desired, as is often thecase, to retain the platen in the upper-case position during theprinting of considerable matter, this will be accomplished by theoperator turning the thumb-wheel 169 in such manner as to cause thecrank-arms 162 and 163 to swing from the normal' position (seen in Fig.24) to the position shown in Fig. 25 of the drawings. When the shaft 161is thus turned, the upper end of the crank 162 will swing rearwardly andthe crank 163 will swing forwardly, thereby striking the pin 164, andthus drawing forwardly the link 158, so as to cause the platen W to beraised tothe upper-case position', as above described. rlhe rear\vardmovement of the crank 162 is suiiicient to bring the yoke R to theposition seeny in Fig. 25, and in such position the coil-spring R willexert its force to hold the parts Ain such position, thereby retainingthe platen elevated for the printing of upper-case letters. By reasonofthe' pin-and-slot connection (shown in Fig. 23) between the shaft 160and the crank 170 it will be seen that when the crank 159 is shifted byturning the thumb-wheel 169, as just described, the pin 171 will movealong the slot 172 and will not disturb the crank 170 nor the arm 173 ofthe upper-case keylever. When the platan W is to be restored to'normalposition, the operator will reversely turn the thumb-wheel 169, so'as tobring the parts againto the position seen in Fig. 24.

In order to cause the platen W to be shifted from normal to upper-caseposition by the easy touch of the operator of the upper-case key-lever,I have provided springs for counterbalancingl the weight of the platenand its frame. By reference to Figs. 1 and 26 of the drawings it will beseen that to each end of the carriage J is connected, as at s, aplatespring S, that is curved varound the carriage and has its free endbearing against the screwheads 147 at the end of the lower cross-barofthe platen-frame. The force of these springs is such as tocounterbalance in great measure y vthe weight of the platen and itsframe, so that these parts lnay be lifted with but slight clfort by theshifting of the upper-case keylever or by turning the thunib-wheel 169,as hereinbe'fore described.

The lower front bar 143 of the platen-frame isrevoluble in its bearingsand is provided at its ends with the usual springs (not shown) thatserveto turn this bar downwardly and inwardly; but as this feature forms nopart of the present invention it neednot be more fully described. Uponthe front rod 143 (see Fig. 7) and at each side of the collars 1f, thatare fixed to the rod 143, are pivotally mounted the yoke-shaped ends ofthe arms t', that extend rearwardly beneath the platen and (see Figs. 7,v10, 12, and 13) have their upper ends provided lOl.)

with 'ournal-bars t2, whereon are mounted y the presser-rolls T, theseVrolls being held in extends downwardly beneath `and upwardly throughopenings u, formed in thelower section U of the paper-table. Thissection U of the paper-table is fixed to the arms u', and it in frontoflthe platen W, as clearly shown in Figs. 7, 12, and 13 of the drawings.The arms u'are providedv with hubs. u2, that env circle the lowerplaten-rodvlt and are, held in position upon the rod by the collars 190.The upper frontedge of 4the section U of the paper-table is providedwith the usual scale if, i

the spaces of which correspond to the escapement movement of thecarriage. From the front rail 52 of the carriage extend upwardlyy andrearwardly suitable sockets (see Fig. 12) that receive the ends i: ofthe standards V, (see Fig. 10,) to the upper kends. of'which is fastenedthe upper section U of the papertable. ,The adjoining edges of the upperand lower sections Uv and U of the paper-table are formed of irregularoutline,as shown in Fig. 10, and these edges are bent rearwardly, asshown at if, so that. all danger ofthe paper being caught by the edgesof the table is avoided. For like reason also the upper and lower edgesof the cut-away` spaces u of the paper-table section U are bentrearwardly, as shown. By the use of the long paper-tableI have foundthat the paper need not be guided into the machine with one hand whilethe cylinder is being turned with the other, as in other machines. Thepaper will drop to its proper place by its ownweight and will guideitself much. more evenly than by the. other method. This `is a verydesirable feature, sinceit enables the operator' to insert paper inthemachine very quickly. i By dividing the paper in two parts, the largerpart of which is;

iixed tothe carriage, I avoid the necessity of lifting this larger` partwith the platen when the vupper case is used, the weight of which wouldmaterially detract from the light touch,

which is a great advantage. On theleft-hand end portion of the frontplaten-rod 143is fixed the hub 195 of a lever 196, this lever beingprovided with a linger-piece 197, (see Figs. 2 and 7,) whereby the levermay be easily ma'- nipulated, and by pushing rearwardly thisfinger-piece the lever 196 will turn the rod 143- against'the force ofthe springs (not shown) at its ends and in so doing will turn thecollars t', so as to relieve the force of the springs T on thepresser-rolls T. It is often desirable to ease the pressure of therolls, particula-rly in the adjustment-of the paper upon theplaten, y

Suitable springs and the means'last described enables this to be (SeeFig. v8.) This bearing-plate Y is bolted'y I to the downwardly-turnedupper portion of a spring or clamping-plate 200, the rear portion ofthis spring passing down and against the cross-rod 414:2 and being.provided with' an` offset 201, adapted to engagea longitudinal groovein the rod. (See Fig. 12.) The spring 200 has its upper front portionformed with a tongue 202, adapted to bear against an offset' or lug 0cVon the casting-w, this tongue 202 serving to force the roller Xdownwardand against theA surface of the platen W or the paper carried thereon.The rearportion of each of the springs 200 passes downwardly lbehind thecorresponding presser-roll X and is cut away to permit the presser-rollto pass thereth rough, and each of the springs or clamping-plates 200has .its lower edge extending to and preferably slightly over the scalea3 at the front of the platen. y 200 are provided with inwardly andupwardly So, also, each of the springs or plates veXtending'guide-fingers 204, that serve to aid in guiding the paperaround the platen and to hold it smoothly thereon` By reference to Fig.7 it will be seen that each of the castings` is provided with an offsethandle m3, whereby the' rolls X may be turned upwardly and away fromtheplaten, and when vthe rolls are thus turned the lugs my ofeach of thecastings will interlock with the spring-tongue 202 and retain the rollsX in such upturned position.

IOO

I-Iaving thus described my invention, what l I claim as new, 4and desireto secure by Letters Patent, isp 1.r In a' frontstrike typewritingmachine, the combination vwith a main frame comprising a base and anupright portion at the rear of said base portion, of a paper-carriageand platen mounted at the rear on said upright portion, type-barsarranged about a printing-point `upon the front side of said. platemascale arranged adjacent said platen and below said printing-point,linger-keys arrangedk to operate said type-bars and to form -IIO akeyboard at the front of said base portion and an inclined copy-holdermounted at the front of said. upright portion, directly above saidkeyboard and intermediate the latter and said platen, the parts beings'o arranged that the printed line, the scale, thecopy-holder and thekeyboard are positioned directly in front of and within the visual rangeof the op- Y 2. In a type-writing machine, the combina-- tion with apower-propelled part and with an erator.

escapement mechanism therefor -comprising

